Fenwal 05-296423-750 24 VAC Direct Spark CSA

SERIES 05-29 24 VAC DIRECT SPARK IGNITION SYSTEM

This 24 VAC direct spark ignition system provides an efficient and reliable way of igniting your gas burner application. Its wide selection of features makes it the most versatile system available.

VERSATILE TO MEET YOUR SPECIFIC NEEDS
Depending on the model selected, flame sensing is achieved through the ignition electrode or a separate remote flame sensing electrode. The system is available in single or multiple trial-for-ignition versions. Also selectable are a 15- or 30-second prepurge period, the length of the trial-for-ignition period, a post purge period and a combustion blower control relay. And the system module may be ordered with or without its fire retardent plastic case.

AGENCY CERTIFIED
The 05-29 system is certified by the American Gas Association as conforming to ANSI Z21.20. It is also certified by the Canadian Gas Association and is a UL recognized component.

COMPACT SIZE - EASY TO MOUNT
The electronic module (including enclosure) measures only 5.69 x 3.94 x 1.87 in (144.4 x 99.9 x 47.5 mm) and weighs approximately 5.1 oz (145 g). It is not position sensitive and may be mounted vertically or horizontally using standard hardware. All connections are made with standard Y4 inch quick connects.

INNOVATIVE DESIGN FOR SAFE AND EFFICIENT OPERATION
Flame sensing is achieved through the technique of using the high voltage spark electrode as the sensor or through a separate remote sensing probe. All models use the principle of flame rectification to monitor the burner flame. In addition, a patented* self-monitoring safety circuit provides a type of protection not found in other ignition systems.

ECONOMICAL SELF-CONTAINED INDUCER BLOWER CONTROL
If you use a combustion air blower, there is no need to incur the cost and inconvenience of a separate control system. The Series 05-29 system has an optional inducer relay integral with its electronic package.

SPECIFICATIONS

PRINCIPLE OF OPERATION

The Series 05-29 system is designed to operate on 24 VAC. To ignite the burner, it is only necessary to set the thermostat to call for heat. When power is supplied to the appliance, the control system opens the main gas burner solenoid valve and provides ignition spark Sparking ceases as soon as a constant flame is present. If the flame is not established during the trial-for-ignition period, the system provides automatic shutdown by de-energizing the gas solenoid valve and going into lockout. The multiple trial-for-ignition model, however, provides for three complete ignition sequences before going Into lockout.

Once the flame is successfully established, electronic flame sensing circuitry (flame rectification) monitors the continued presence of the burner flame. If an established flame is extinguished for any reason, the system will retry for ignition before going into lockout. The number of retries depends on the model selected. Reset after lockout is accomplished by adjusting the thermostat to a setting below ambient temperature for five seconds and then returning to the desired temperature setting.

Models with the optional 15- or 30-second (nominal) purge period allow the combustion chamber to clear itself of any residual gases before each try for ignition. Models without the prepurge option have less than a 1.0 second delay before a single try for ignition.

Inducer Blower Control Option

When the inducer option is selected, the inducer contacts are powered when the thermostat calls for heat The blower shuts off when the thermostat is satisfied. However, when the inducer option is used in conjunction with the postpurge option, the blower stays on for an additional 45 seconds.

MOUNTING

The series 05-29 system is not position sensitive and may be mounted vertically or horizontally using standard hardware; #6 for the model with integral mounting standoffs and #8 for the one with an enclosure.

WIRING WARNINGS:

The Series 05-29 System uses voltages of shock hazard potential and operates in the presence of combustible gas. Failure to observe the following warnings could result in shock, fire, or explosion causing severe injury or death.

1. Wiring and initial operation must be done by a qualified technician.
2. Before wiring system, manually shut off gas supply and remove power.
3. Do not reapply power until all wiring is connected and system is properly grounded.
4. Perform Initial Operation before turning on gas supply

ROPER ELECTRODE LOCATION

Proper location of the electrode assembly is important for optimum system performance. It is recommended that electrode assembly be mounted temporarily using clamps or other suitable means so that the system can be checked before permanently mounting the assembly. The electrode assembly should be located so that the tips are inside the flame envelope and about 1/2 inch (1 cm) above the base of the flame.

INITIAL OPERATION

1. Check installation, electrode mounting, and electrode gap per previous sections.
2. With gas supply manually shut off, apply power to system and advance thermostat above ambient temperature.
3. 3 Ensure that a spark is being produced at electrode during trial-for-ignition period. System should lock out after the period. In three try for ignition version, system will automatically recycle two additional times, then lock out.
4. Reset thermostat to below ambient temperature.
5. Wait 5 seconds, then manually open gas supply and advance thermostat above ambient temperature to recycle system. Check that ignition occurred. Sparking should cease a few seconds after flame has been established.
6. If system ignites but fails to 'hold-in', check input voltage. Also check that system is properly grounded.

For multiple unit installations, ensure that all units are powered by a common supply voltage and that all are correctly polarized and grounded.